Power transmission



March 17, 1953 c. E. JOHNSON ET AL 2,631,462

POWER TRANSMISSION I5 Sheets-Sheet 1 Filed Sept. 15, 1948 MSN Q EHDTE VON w W ERw MQF R Y A E March 17, 1953 c. E. JOHNSON ETAL 2,631,462

POWER TRANSMISSION Filed Sept. 13, 1948 3 Sheets-Sheet 2 CARL E. JOHNSON EARL MENDENHHLL BY THE/R HTTORNEKS.

HAP/W5, Mac/4, F05 7'5 2 a HARE/5 Patented Mar. 17, 1953 POWER TRANSMISSION Carl E.. Johnson and Earl Mendenhall, San Marino, Calif., assignors to Sterling Electric Motors, Inc, Los Angeles, Calif., a corporation of. California.

Application September 13, 1948, SerialNo. 49,034

11 Claims.

This invention relates to. variable speed power transmissions and, more particularly to variable speed. power transmissions of the. type incorporating one or more V-type pulleys having variable diameters and attaining: such diametrical variability from the: cooperation of a fixed, frusto-conical flange utilized: in conjunction. with an axially shiftable, irus-to-conical flange.

The utilization of V:-ty-p.e pulleys having variable diameters and consisting of an: axially shiftable frusto-conical flange utilized in conjunction with afixed, frusto-conical flange. is an old expedient but the major diiiiculties which arise from. the use of such variablev diameter pulleys in speed. reducing-i assemblies. spring from the dintculty inherent in providing adequate: linkage and control means adapted to control the accurate displacement of. the axially shiftabl-e flange of.

such a pulley in. relation to the fixed flange thereof. Although it is customary to utilize suchvariable diameter pulleys in cooperating pairs in speed changer unitsand we, therefore, describe our invention as used. in conjunction with a pair oi such pulleys, it is conceivable that the basic concept of our invention might. be utilized in conjunction with a. speed changer assembly conslsting of a'conventicnal V-type:pulley-associated with a V-typepulley having avarying diameter;

Fundamentally, our invention resides in. the

provision of linkage means adapted to. permit the simultaneous and proportional'control of the axial displacement. of the. movable flange of a drive pulley inconjunction; with and in proportion to the axialdispiacementof: the movable flange of a driven pulley, associated therewith 1 through themedium of a, conventional V -belt.

Although the basic conceptof providing; a pair of such variable. diameter pulleys is not new, the variable speed control. linkage provided by our invention permits the utilization of such pulley combinations in applications-where it has. been previously infeasible to incorporatethem'.

One of the major di-fliculties encountered in prior art speed contrclli-nkages. for the control of the movement of the. axially shiitable flanges of variable diameter -type pulleys has been the fact that such linkages occupied a comparatively large area and the incorporation thereof in conjunction with a power source within a housing necessitated the provision of a housing oi considerable proportions. Since speed changing al paratus of this type is. frequently incorporated in and, associated with machines which provide a minimal amount of room for such apparatus, the useofflspeed changers of the conventional 2 type embodied in relatively large housings was impractical.

It. is, therefore, a primary object of our invention to provide a variable speed changer which incorporates a pair of variable diameter V-type pulleys which are utilized in conjunction with and which are adapted to be controlled by a linkage which occupies a much smaller space than has hitherto been necessary for conventional linkages adapted to control such pulleys. Thus, the size of housing incorporating such speed reducing assemblies can be materially reduced and the range of application of such speed reducers greatly enlarged.

Previous control linkages have utilized a plurality of Widely spaced levers adaptedv to simultaneously control the movement of the axially shiftable flanges of the pulleys and have also incorporated spaceconsuming screw, or similar, means adapted to activate the lovers to move the axially shiftable flanges. Such prior art control levers are usually disposed on either side of the pulleys to be controlled and. are usually arranged with their longitudinal axes normal to the axis of rotation of the controlled pulley. Also found. in the prior art are chain and sprocket control arrangements whereby the rotation of a sprocket incorporated upon a screw means. embodied in the. variable diameter pulley will cause the axial shifting of the movable flange therearound. All of. these arrangements for controlling such pulleys necessitate the utilization of relatively large sized housings to permit their incorporation therein.

It. is another object of our invention to provide a contro1 linkage for a variable speed transmission apparatus which. utilizes a first control lever and a second control lever pivotally mounted within thehousing in which they are embodied and having free ends adapted to contact the axially shiftable flanges of the pulleys with which they are associated, said free ends being spaced a distance substantially equal, to that lying between the axis of rotation of the pulleys with which they are associated. In other Words, only little more space is consumed by the control linkage than is necessary to. house the pulley combination itself and the exterior dimensions of the housing in which the variable speed apparatus is embodied may be materially reduced.

Another object of our invention is the provision of a control linkage for a. variablev speed changer which is adapted to positively control theproportional change in the diameters of the. associated pulleys in the apparatus.

A further object of our invention is the provision of a control linkage for a speed changing apparatus adapted to be associated with an electric motor which has incorporated therein adjusting means designed to permit the minimal and maximal limits to which the diameters of the pulleys may be varied to be simultaneously adjusted.

An additional object of our invention is the provision of a control linkage adapted to be utilized in a speed changing system which has associated therewith visual indicating means designed to indicate the speed ratio at which the control linkage has positioned the associated pulleys incorporated in the apparatus.

Another object of our invention is the provision of a speed changing apparatus including control linkage therefor which is provided with actuating means for said control linkage having incorporated therein means adapted to limit the maximal and minimal extent to which the speed changing linkage can be adjusted.

A further object of our invention is the provision ofa control linkage for a variable speed control apparatus which is comprised of a minimum number of simple parts and which is of extremely durable construction,

Other objects and advantage of our invention will become apparent from a perusal of the following specification and the accompanying drawings, which are for the purpose of illustration only, and in which:

4 Fig. 1 is a side elevational view of the speed changing apparatus incorporating the principles of our invention;

Fig. 2 is an enlarged vertical sectional view taken on broken line 2-2 of Fig. 1;

Fig. 3 is a vertical sectional view taken on broken line 33 of Fig. 2;

Fig. 4 is a fragmentary, enlarged view of the actuating and control means for the control linkage taken in the direction of the arrow 4 of Fig. 2; and

Fig. 5 is a fragmentary, partially sectional, partially plan View taken on broken line 55 of Fig. 4,

Referring to the drawings, we show a variable speed power unit it which is incorporated in a substantially unitary housing I i and which in- Qcludes an electric motor i2 which constitutes the primary power source of the unit. Associated with the electric motor 42 and adapted to vary the speed of rotation of an object, not shown, driven by said motor i2 is a variable speed con-.- trol linkage [3 which is adapted to be actuated and adjusted by actuating means indicated generally at 14.

Associated with the actuating and adjustment means M for the variable speed control linkage I3 is an indicating mechanism l5 which is adapted to indicate the amount of adjustment imparted to the variable speed control linkage 13 by the actuating and adjustment means 64. The housin H of the variable speed power unit I?) may be generally divided into an upper portion l6 which shrouds the electric motor i2 and a lower portion 5'! which incorporates the actuating and adjustment means 54 for the con- ;trol linkage, it being understood that the variable speed control linkage is is housed in both portions of the housing H at one side thereof. The lower portion I! of the housing H is provided with a plurality of feet it which are adapted to permit the housing H to be fixedly but removably mounted upon a surface with which it is as* sociated.

The ends of the upper portion it of the housing H are constituted by two removable bells or end members 26 which are secured to the upper portion It: by means of screws 2 l, or similar fasteners. The electric motor 52 is enclosed by the upper portion it of the housing ii and consists generally of a stator 22 encompassing a rotor 23 which is mounted for rotation within the field of the stator upon a drive shaft 24.

Provided in the bells 20 secured to the upper portion I6 of the housing I l are bearing housings 28 which receive thrust bearings 21 in which the opposite ends of the drive shaft 24 are rotatably mounted. Secured to the shaft 24 adjacent the rotor 23 and adapted to be rotated thereupon is a fan 29 which draws cooling air through apertures 26 provided in the bells 2D to cool the motor during its operation.

Mounted upon a drive portion 30 of the shaft 24 is a V-type drive pulley 3! which is capable of having its diameter varied by the action of the variable control linkage l3. The drive pulley 3| includes a fixed, frusto-conical flange 32. The hub 32a. of the fixed, frusto-conical flange 32 is provided with internal, longitudinally directed keyways 35a which are adapted to receive portions of longitudinally extending keys 34 mounted within keyways 35 formed in the shaft 25. Thus, the fixed flange 32 of the pulley 3| is keyed against relative rotation in reference to the shaft 24. To prevent the axial shifting of the fixed flange 32 of the pulley 3! the hub 32a thereof is provided with a plurality of set screws 33 which impinge upon the keys 34 and prevent the lateral displacement of the fixed flange 32.

Associated and in operative relationship with the fixed flange 32 of the pulley 3| is a frustoconical, axially shiftable flange 36 having an elongated, sleeve-like hub 31 in which are formed elongated keyways 35b adapted to receive the keys 34 suitably mounted within a keyway 35 provided in the shaft 24. The keys 34 and the cooperating keyways 35 and 35b prevent the rotation of the axially shiftable flange 33 in reference to the shaft 24 but,.since the hub 31 is in no other way fixed to the periphery of the shaft 24, the flange 33 is capable of axial and lateral movement upon the shaft 24.

Mounted upon the elongated, sleeve-like hub 37 of the axially shiftable flange 36 is a thrust bearing 38 which is encompassed by a generally annular bearing housing or lug member 39. Since the bearing 38 is interposed between the hub 3'! and the bearing housing 39, the bearing housing39 may be restrained from rotation in respect to the hub 31 by suitable means to be described in greater detail below. Integrally formed upon the bearing housing 39 is a plurality of spaced lugs 42 which are disposed axially of the drive shaft 24 and which define between them a slot 43, the purpose of which will be described more fully below. Trained upon the V-groove defined by the cooperative relationship established between the fixed flange 32 and the axially shiftable flange 33 is a conventional V-belt 44 which is adapted to transmit the driving power of the drive shaft 24.

Suitably mounted upon the ends of the lower portion 17 of the housing H, as by means of screws 45 or similar fasteners, are closure members orbells 46. Centrally located in the bells 46 are bearing housings 41 adapted to receive thrust bearings 48 in which is rotatably mounted a driven shaft 49 having its axis substantially parallel to the axis of the drive shaft 24. One

end 5.0. 201 the driven. E9; protrudes; from the bearing: housing; 41- and'is'adapted'to have mounted thereupon any suitable; power: trans;- mitting means,.not.shown, to permit the opera;- tion by. the variable: speed power unit It: of-v any desired machine. or' apparatus,v not shown..

Mountedithe' driven shaft 49 and adapted be. rotated thereby isv a. driven. \t-type: pulley 5 1' which: includes a. fixed, frusto-conical: flange 52 incorporating a: hub portion 52 and provided withlongitudinally extending keywaysl 53? formed upon the interior oi: saidr huh'portion 5:2 to; Suit:- ably disposed within keyways 54; formed. in. the driveir shaft 49 are; longitudinally extending keys 55awhich are adapted to retain theflxed, flange 52; for rotation with the shaft; 4 9. Set screws 5217 are provided in. the: hub portion: 52a: of the fixed. flange 5:2 and are adapted to impinge. upon the keysii; to: prevent the. lateral and axial: dis:- pl'acement of the fixed. flange 52;. Associated. with: the fixed flange 5.21s. an axial-.- ly-shiitable, frusto-conical flange" 56.: which includes an integral elongated hub: 51' having in ternally. disposed keyways 53 adapted to cooperate with: the. keys. 55 mounted in: the 'keywayst E4 of the driven shaft 49;. The keyed relationship of. the axiallyshiftable; flange 56 of the pulley 5t tothe shaft 49." prevents the relativerotation of said flange in-reference to the driven shaft 49- but since: the flange 56- is in" no. otherway aifixed to the driven; shaft 49, the.- axial shifting of the-flange Btthereuponis permitted. Mounted upon the hub portion" 5.! of the axially shiftable flange 55 is. athrust bearing 58 which. is encompassed by a bearing: housing or lug memberifl.

The bearing housing: 59 is: provided with a. plurality of axially directed, spaced, integral lugs 610 tvglliich cooperatively definetherebetween a s o Mounted within a boss fic'formed. integrall with the interior of the housing. I! and adapted to be obliquely maintained therein in. reference to the vertical axis. of the housing ll through the medium of an obliquely disposed guide slot formed in-said boss is a first. control lever Hi.

The controllever Htis of generally rectangular.

cross section and'is constituted: by an: elongated rectangular rod 'il,,.the lower end 12 of which is pivotallymounted upon a; pivot pin 13' which isadaptedto be received in a hole 61: formed in the boss 55 and which: is securely maintained in operative relationship with the first control lever. w-through the medium of a setscrew M threadedl-y engaged. inthe lower end 1.2. of the first control lever mg. The. free. upper endfls of the first control lever to is adapted to be inserted in the slot 43 defined by the integral lugs 42- upon the bearing housing 39- and is intended. to control the. axial shifting of the movable flange tiirof the v=drive pulley 3i. p

Pivotally mounted upon an integral bossfit formed in the interior of thehousing. H and di-- rectedobl-iquely downward. by its contact with the obliquely disposed upper surface 84 of said bossis a second-control lever til which is constituted by an elongated rods-i of generail-y rectangular cross section. The second control lever is maintainedatits upper endB'Z. iii-pivotal suspension upon the. boss 855 through the medium of a headedpin 85=vvhich is retained in a hole formedv in said boss through the medium ota snap ringed encompassing the end of said pin 55; The second. control lever to is directed downwardly-and obliquely in reference to thevertical axis of the housing. H and its lower end iihisadaptedto be; received-1n the slot slicefined. byv the integrallugs 6.1% formed. upon the: bearing housing; 5!!- associated; with the: movable: flange 56. of the; driven'pulliey 5 I:.

As; best shown. inv Figs; 2" and 31 of the drawings; the pivotally supported. ends of the first, and second control; levers TB: and 8t intersect adiacent. their pointsof pivotal mounting and diverge from their points of pivotat mounting to engage, respectively", the-slots 43- and; t l When. thus engaged: ingthe slots.- 43* and. ii I the free; ends 15 and 8?! of. the" control levers 1d and 88 are spaced apart by a. distance which is substantial ly'equal to the distance between the axes of rotation of the pulleys with which they are re-- spectiveiy associated; The manner in which the control levers. 80' and H! are obliquely disposed in reference to the vertical axis of the housing, lit permits the control linkage-to be accommodatedin a spacer much smaller-than has hitherto, been possible with prior art linkages and the accom modation of the speed changing mechanism in housings of. smaller proportions than has hitherto been. possible is thus readily accomplished.

In order to insure the proportionaland simul: taneous movement of the control levers 1-0 and; 8d, there is provided between the control levers it andtfl connecting means to which com-prises a threaded adjusting screw 95. and an oppositely threaded adjusting screw 92, operatively combined: by means of an adjusting sleeve 93.. The provision of the oppositely threaded adjusting screws 9.1 and 92 in conjunction. with the adjusti-ng sleeve 553 permits thespatial relationshiprbetween the ends of the control levers it; and 8E! to ice-accurately adjusted and also determines the maximum limit between which the diam eters of the pulleys may be varied. The provision'of. the connecting means fill-alsoserves to retain. the free ends t5- and. 8.1- ofthe control levers itand. so continuous contact with the slots 4. 3 and 6:1 in. which they are. seated and thus prevents the dislodgement of the control lovers from said slots. In order toprevent the inadvertent dislocation of the: connecting means 519, a lock nut 94- associated with the adjusting sleeve fiil iszprovided which. maintains the adjusting: sleeve. 93. in its: predetermined I position until voluntarily disturbed.

As: best shown in Figs. 2 and 3-of thedrawings, the connecting means pivotally engagesthe first control lever iii and the second. control lever 35 intermediate the pivoted andtree ends thereof and: adjacent the points of-pivotal suspension. The connecting means so is operatively and pivotally maintained in contact with the control levers Til and Bi}. The end of the adjusting screw 9.1 is provided with a right angle portion 95 adapted to be received in a holein the first control lever 10 and to; be retained therein through the medium of a. snap ring 96 encompassing the. end of the right angle. portion 9-5. In a similar manner, the adjusting screw 92 isprovided with a right angle portion 9? which is operatively retained in a hole provided in the second control lever 8% and maintained therein by means of a snap ring 93. surrounding the end of said right angle portion. v

The actuating and adjusting mechanism M for the control linkage 33 comprises a generally cylindrical, elongated control rod iii-i whichis provided with an intermediate threaded. portion iii-2. (Figs. c and. 5-) and; which has one end [93 protruding from the rear of the hell 4&- andthe other end: Hi l protruding from the front. of

the bell 40. The control rod IOI has its end portion I03 provided with a thrust collar I which is secured to the end portion I03 by means of a screw I08, or a similar fastener, and which is adapted to prevent the longitudinal displacement of the control rod IOI. Fixedly mounted upon the other end I04 of the control rod IOI, as by means of a fastener I09, is a hand wheel I06 which is adapted, when rotated, to cause the concomitant rotation of the control rod IOI.

Threadedly engaging the intermediate threaded portion I02 of the control rod I0! is a travelling nut I I0 which has formed thereupon an upwardly directed integral boss III and which is provided with a dual stop pin II2 which has its longitudinal axis arranged parallel to the longitudinal axis of the control rod IIII. Mounted upon opposite ends of the intermediate threaded portion I02 of the control rod IOI are stop blocks H4 provided with a plurality of stop pins I I3 adapted to cooperate with the dual stop pin IE2 of the travelling nut H0. The stop blocks H4 are fixedly maintained upon the threaded intermediate portion I02 by means of screws H5, or similar fasteners, and are adapted to limit the longitudinal movement of the travelling nut H0 upon the threaded intermediate portion I02 of the control rod IOI and thus determine the extent to which the control linkage I3 can be actuated. When the maximum travel of the travelling nut H0 in either direction upon the inter mediate threaded portion I02 has been reached, one of the stop pins H3 is contacted by the dual stop pin II2 of the travelling nut H0 and the further travel of the nut H0 is prevented.

Pivotally suspended upon the upwardly directed, integral boss III of the travelling nut IIB is a link II'I which is secured upon the boss III through the medium of a snap ring IIS encircling the periphery of that portion of the boss which protrudes above the upper surface of the link In. Secured to a bracket III) formed integrally upon the upper part of the interior of the bell 46 through the medium of a bolt and nut combination I2I is a bell crank I which is provided with a central hub portion I20 lying between a driven arm I22 and a driving arm I 2-3. Disposed within the hub I25 of the bell crank I20 and adapted to serve as a bearing therefor is a spacer sleeve I25 which encircles the shaft of the bolt I2l.

Secured within an aperture I21 formed in the end of the driven arm I22 of the bell crank I20 isa stud I28 having a head I20. The link II? is provided with an opening I I6 which is adapted to engage the head I29 of the bell crank stud I28 and the movement of the travelling nut H0 upon the intermediate threaded portion I02 of the control rod IOI is thus transmitted through the link II! to the end of the driven arm I22 of the bell crank I20 to cause the rotation of the bell crank I20 in an arcuate path upon the boltnut combination I2! below the integral bracket H9. The bell crank I20 thus constitutes the means by which the longitudinal motion of the travelling nut I I0 upon the intermediate threaded portion I02 of the control rod I0! is adapted to be transferred to the control linkage constituted by the control levers I0 and S0 and their connecting means 90. To establish the operative relationship between the driving arm I23 of the bell crank I20, there is provided an oifset link assembly I3! which is fastened to the end of the driving arm I23 of the bell crank I20 through the medium of a bolt and nut combina- 8 tion I30. The offset link assembly includes a plate I32 and a plate I33, one of said plates being obliquely disposed in reference to the other in order to facilitate the fastening of th oblique plate to the obliquely and downwardly directed control rod 80. In the present instance the plate I33 is shown as being obliquely disposed with reference to the horizontal plane of the bell crank and the plate I32 and is adapted to be secured to the second control lever 80 through the medium of a bolt and nut combination I34 which permits the pivotal movement of the lever 80 upon the surface of the plate I33.

Thus, when the travelling nut I I0 is caused to be longitudinally displaced upon the intermediate threaded portion I02 of the control rod I0! because of the voluntary rotation of the associated hand wheel I06, the movement of the travelling nut IIO will be communicated to the end of the driven arm I 22 of the bell crank I20 through the medium of the connecting link Ill. The bell crank I20 will then rotate upon the bolt -I2I causing the offset link assembly I3I to be carried upon the end of the driving arm I23 of the bell crank and, in turn, causing the lateral displacement of the second control lever 80.

Associated with the travelling nut I I0 through the medium of the driven arm I22 of the bell crank I20 is an indicating mechanism I5 which includes a support arm I37 mounted upon a reduced screw portion I35 of the stud I28 by a nut or similar fastener I36. Pivotally secured at one end to the support arm I3! through the medium of a pin I38 or similar fastener is a rack gear I40 which engages a pinion MI and is retained in engagement therewith through the medium of a rack carrier I 43 which is supported upon a shaft IM which also mounts the pinion I II.

Positioned externally of the housing and adapted for rotation on and by the pinion shaft I44 is a visual indicator I 45 (Fig. 2) which bears upon its periphery indicia I46 adapted to indicate the speed at which the speed changer apparatus has been set. When the driven arm I22 of the bell crank I20 is moved by the travelling nut III] the rack I40 is carried on the support arm I31 to rotate the pinion I 4| and the indicator I45. Thus, the accurate indication of the speed at which the speed changer apparatus has been set is rendered feasible.

We thus provide by our invention a variable speed changer apparatus which is adapted to be incorporated in a much smaller housing than has hitherto been possible with apparatus of this type. This desirable feature is secured through the utilization of first and second control levers which are uniquely arranged with their ends pivotally suspended within the housing and intersecting each other adjacent the point of pivotal suspension. By this method of suspension and by intersecting the ends of the levers adja cent the points of pivotal suspension, the free ends of the levers need be spaced only so far apart as the distance lying between the axes of rotation of the diametrically expansible and contractible pulleys whose diameters are to be controlled by the free ends of the levers.

Also provided by our invention is a highly efficient and durable actuating and adjusting means whose motion is designed to be effectively communicated to one of the levers and trans- 'mitted to the other of the levers through the medium of adjustable connecting means which serves also to determine the maximal and minii9 malexpansion and contraction permitted or :to the variable {diameter v-pulleys.

Although we have shown and described :a preferredemhodiment of our invention, it isohvious that certain portions and elements thereof may "be replaced byother portions and elements thereof having similar functions and we, therefore, do'not intend to limit our invention to thespeciflc details of construction shown but prefer rather that we be accorded the full scope of the following claims.

We claim as our invention: I

1. In :a control linkage adapted .to be utilized conjunction with a variable diameter drive -pulley whichincludes twofrusto-conical flanges,

one of which is axially shiftable upon a drive shaft in respect to the other, and a variable diameter driven pulley which-includestwofrustoconical flanges, one of which is axially .shiftable upon a driven shaft in respect to the other, said drive anddriven shafts being maintained in sub.- stantial parallelism within a common housing .and said drive and driven pulleys having a M belt trained thereupon, the combination of la first control lever having one end pivotally mounted upon the interior .of said housing and its free end contacting theaxially shiftable flange of said drive pulley .and adapted to control the movement thereof; a second control lever having one end pivotally mounted upon the interior of "said .housihg and its .free end contacting the axially shiftable flange of said driven pulley and adapted to control the movement thereof, the pivotedends of said levers being ,laterallyspaced :and lying crosswiseof each other adjacent their points of pivotal suspension; connecting means pivotally engaging said levers intermediate the nected to one of said levers adapted to shift said one lever and theother lever laterally and concomitantly through said connecting means.

2. In acontrol linkageadapted to .be utilized in conjunction with a variable diameter .drive pulley which includes two frusto -conical flanges, one of which is axially .shiftable upon a drive shaft in respect to the other and a variable diameter driven pulley which includes two fruStoconical flanges, one of which is axiallyshiftab'le upon a drivenshaft inrespect to the other, said drive and .driven shafts beingmaintainedin substantial parallelism within a vcommonhousing and said drive and driven pulleys having. a V- .belt trained thereupon, .thecombinatlon of: a first control lever having one [end pivotally mounted upon .the interior of said housing and its free end contacting the axially sh-iftable flange of said drive pulley and adapted to control the .movement thereof; a second control lever having one end pivotally mounted upon the interior :of said housing and its free end contacting the axially shiftable flange of said driven pulleyand adapted to control the movement thereof, the pivoted ends .of said control levers lying crosswise of each other; connecting means .pivotally engagingsaid levers intermediate the ends thereof, said connecting means .being expansible to simultaneously adjust the freeends of vsaid levers in contact with said shiftable flanges; and actuating means pivotally connected to .one .of said levers adapted .to shift said one lever and the other lever laterally and concomitantly through said connecting means.

.3. ,In a control linkage adapted toloeutilizedin conjunction with. a variable diameter. drive pulley which includes two frusto-conicalflanges one .of

.10 which is axially ,shiftable upon ,a .drive shaft in respect to the other, and a variable diameter driven pulley which includes two. frusto-conical flanges, one of which is axially shiftable .upona .drlvenshaft in respect to the other, .said drive and driven shafts :being maintained in su'bstantial parallelism within ,a common housing and said drive and driven pulleys having a V-helt trained thereupon, the combination of: a first control lever,.;having aone end pivotally mounted upon the interior of said housing and its ,free end contacting the axially shiftable flange of said drive :pulley and adapted to control the move- .ment thereof; a second control leverhaving one end ,pivotally mounted upon the interior orsaid housing :and its .free end contacting the axially ..sh-iftalol-e flange .ofrsaid driven-pulley annd adapted :to :controlthe movement thereof, said levers lying crosswise of each other adjacent their pivoted ends and having their free ends diverging to form .a substantial V-shape in side elevation,- connecting means pivotally engaging said levers intermediate .the ends thereof, said connecting means engaging said levers adjacent thei p i ts of pivotal s sp ns on; a d actu i means pivotal y connected to one ,of said levers adapted r30 ,Sl'l-lf 0 said one lever and the -,.o ther ;lev er laterally and concomitantly through ,said v con- Q tine z fifl si. in a control linkage adapted to be :utilized 111:,conjunct1on with ,a varianle diameter drive pulley which includesltwo lrusto-gcomcal flanges, one of which axially shiitaole 11pon,.,a .drive shaft in respect to the othenand a variable diameter drlvehxpulley whicnmcluoes two rrus-tocomcal flanges, one of Which is axially shiI'ta-ble upon a driven .shartlin respectito the othensaid drive .zorlv-en shafts helng :m-alntamed .in .substantial parallelism within a common housing and ,said lurrvaeiahd driven pulleys having a V- "belt trained thereupon, the combination of: a LfilESll control layer having one end pivotally mounted upon the interior of said housing and :its .free .end contacting the axially shiftable fla ge of said CiLlVB pulley and "adapted to con- ;trol athe movement thereof; a second control lever having one endpivotally mounted upon the interior :OI' said housing and its free end contactin-g the axially lshirtaole flange of said' driven pulley and adapted to control the movement thereof, said levers lying crosswise of each other ad acent their-pivoted-ends and having their free ends diverging to form a substantial -V--shapein side elevation; connecting means p-ivotal'ly enof the axially 'shifta'ble flange in reference to the flxed'flange of a variable diameter driven pulley mounted upon a driven shaft, the combination of: a'first control lever pivotally mounted upon said housing; a second control fleverpivo-jtally mounted upon said housing the free ends .401

"gear gee saidflrst and second levers contacting respecof said drive and driven shafts.

6. In a linkage adapted to-proportionally and simultaneously adjust within a housing the position of-the axially shiftable flange in reference to the fixed flange of a variable diameter drive pulley mounted upon a drive shaft and the position'o-f the axially shiftable flange in reference to the fixed flange of a variable diameter driven pulley mounted upon a driven shaft, the com- 'bination of: a first control lever pivotally mounted upon said housin a second control lever pivotally mounted upon said housing, the free ends of said first and second levers contacting respectively said axially shiftable flanges of said drive and driven pulleys; connecting means pivotally engaging said levers for conjoint movement of the free ends thereof; actuating means including a rotatable control shaft in drivingengagement with a bell crank connected to one of said levers adapted to cause said simultaneous and proportional adjustment of said flanges; and indicating means mounted upon said housing connected to said bell crank and adapted to be proportionally displaced in reference to the movement thereof, said indicating means being operable by a pinion which is rotatable by a longitudinally shiftable rack connected to said bell crank.

7. In a linkage adapted to proportionally and simultaneously adjust within a housing the position of the axially shiftable flange in reference to the fixed flange of a variable diameter drive pulley mounted upon a drive shaft and the position of the axially shif table flange in reference to the fixed flange of a variable diameter driven pulley mounted upon a driven shaft, the combination of: afirst control lever pivotally mounted upon said housing; a second control lever pivotally mounted .upon said housing, the free ends of said first and second levers contacting respectively said axially shiftable flanges of said drive and driven pulleys, the longitudinal axes of said levers lying across each other adjacent the points of pivotal mounting and the free ends thereof being spaced apart by a distance substantially equivalent to the distance between the axes of said drive and driven shafts; connecting means pivotally engaging said levers for conjoint movement of the free ends thereof; and actuating means including a rotatable control shaft in driving engagement with a bell crank connected to one of said levers adapted to cause said simultaneous and pro-portional adjustment of said flanges.

of said first and second levers contacting'respec tively said axially shifta'ble flanges of said drive and driven pulleys; connecting means pivotally engaging said levers for conjoint movement of the free ends thereof; and actuating means including a bell crank pivotally mounted upon said housing and a threaded control shaft connected to an arm of said bell crank by a travelling nut shiftably carried by said shaft so that the rotation of said shaft and the concomitant movement of said nut will cause the displacement of one of said levers through its pivotal engagement with the other arm of said bell crank, said bell crank lying in a horizontal plane parallel to the axes of said drive and driven shafts and engaging said one lever adjacent its lowermost end.

9. In a control linkage adapted to be utilized in conjunction with a variable diameter drive pulley which includes two frusto-conical flanges, one of which is axially shiftable upon a drive shaft in respect to the other, and a variable diameter driven pulley which includes 'two frustoconical flanges, one of which is axially shiftable upon a driven shaft with respect to the other, said drive and driven shafts being maintained in substantial parallelism within a common housing and said drive and driven pulleys having a V-belt trained thereupon, the combination of a first control lever having one end pivotally mounted on the interior of said housing and its free end contacting the axially s'hiftable flange of said drive pulley and adapted to control the movement thereof, said first control lever being obliquely positioned with respect to the vertical axis of said housing, the point of pivotal suspension of said first lever being disposed to one side of the axis of said drive shaft and the point of contact of said lever with said flange being disposed on the other side of said drive shaft; a second control lever having one end pivotally mounted upon the interior of said housing and its free end contacting the axially shiftable flange of said driven pulley and adapted to control the movement thereof, said second control lever being obliquely positioned with respect to the vertical axis of said housing, the point of pivotal suspension of said second lever being disposed to one side of the axis of said driven shaft and the point of contact of said lever with said flange being disposed on the other side of said driven shaft; connecting means pivotally engaging said levers intermediate the ends thereof, said connecting means being exp-ansible to simultaneously adjust the free ends of said levers in contact with said shiftable flanges; and actuating means pivotally connected to one of said levers adapted to shift said one lever and the other lever laterally and concomitantly through said connecting means.

10. In a control linkage adapted to be utilized in conjunction with a variable diameter drive pulley which includes two frusto-conical flanges, one of which is axially sh'iftalble upon a drive shaft in respect to the other, and a variable diameter driven pulley which includes two frustoconical flanges, one of which is axially shiftable upon a driven shaft with respect to the other, said drive and driven shafts being maintained in substantial parallelism within a common housing and said drive and driven pulleys having a V-belt trained. thereupon, the combination of: a first control lever having one end pivotally mounted on the interior of said housing and its free end contacting the axially shiftable flange of said drive pulley and adapted to control the movement thereof, said first control lever being obliquely positioned with respect to the vertical axis of said housing; a second control lever having one end pivotally mounted upon the interior of said housing and its free end contacting the axially shiftable flange of said driven pulley and adapted to control the movement thereof, said second control lever being obliquely positioned with respect to the vertical axis of said housing, the pivotal mountings of said levers being disposed at one side of the longitudinal axes of said shafts and the free ends thereof being disposed at the other side of said axes; connecting means pivotally engaging said levers intermediate the ends thereof; and actuating means pivotally connected to one of said levers adapted to shift said one lever and the other lever laterally and concomitantly through said connecting means.

'11. In a control linkage adapted to be utilized in conjunction with a variable diameter drive pulley which includes two frusto-conical flanges, one of which is axially shiftable upon a drive shaft in respect to the other, and a variable diameter driven pulley which includes two frustoconical flanges, one of which is axially shiftable upon a driven shaft in respect to the other, said drive and driven shafts being maintained in substantial parallelism within a common housing and said drive and driven pulleys having a V-belt trained thereupon, the combination of: a. first control lever having one end pivotally mounted upon the interior of said housing and its free end contacting the axially shiftable flange of said drive pulley and adapted to control the movement thereof, said first control lever being obliquely positioned with respect to the vertical axis of said housing; a second control lever having one end pivotally mounted upon the interior of said housing and its free end contacting the axially shiftable flange of said driven pulley and adapted to control the movement thereof, said second control lever being obliquely positioned with respect to the vertical axis of said housing, the axes of said first and second control levers lying across each other adjacent the pivoted ends thereof; connecting means pivotally engaging said first and second control levers intermediate the ends thereof; and actuating means pivotally connected to one of said levers adapted to shift said one lever and the other lever laterally and concomitantly through said connecting means.

CARL E. JOHNSON.

EARL MENDENHALL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 562,234 McIntyre June 16, 1896 1,336,542 Sollima Apr. 13, 1920 1,375,053 Lewellyn Apr. 19, 1921 1,546,996 Reeves July 21, 1925 2,109,247 Clay Feb. 22, 1938 2,347,479 Higgins Apr. 25, 1944 2,398,235 Luenberger Apr. 9, 1946 2,532,762 Deletaille Dec. 5, 1950 2,533,197 Pinkvoss Dec. 5, 1 950 FOREIGN PATENTS Number Country Date 239,598 Switzerland Feb. 18. 1946 368,050 Great Britain Mar. 3, 1932 394,905 Germany Nov. 30, 1922 

